Sodium fluorosilicate Molecular Formula and Weight: Na2SiF6=188.06 Physical and chemical properties: The Sodium Fluorosilicate is white crystallize or crystallize powder,specific weight is 2.68, tiny dissolve in the water, do notdissolve in the alcohol, have the causticity, poisonous, at above 450℃ burn empress, resolve the Sodium fluoride and Silicon tetrafluoride. Uses: use for insecticide, lead alloy welding flux, leather, enamel flux, pottery glaze, opal glass and medical industries, etc. Quality Standards: Index Excellent First Qualitied Sodlum Fluorosilicate content,%≥ 99.0 98.5 97.0 Free Acid (as HCL) content,%≤ 0.10 0.15 0.20 105℃ Weight less on dry,%≤ 0.30 0.40 0.60 Fe content,%≤ 0.02 - - Finess (250μm mesh scroon),%≥ 90 90 90